Running Mac game with online-fix??

I unpacked and sent my game containing online fix to a friend of mine on mac . I was wondering how can we play online together. So he set up Whiskey and ran steam on it and added me as (Steam needs to run to be able to play via online fix). He also added the game in question on whiskey. The game runs well and works on lan. But when i send an invitation to join my lobby online steam doesnt seem to detect the game (he gets my invitation tho). So we tried manually adding the game via steam but in vain.

Any tips on how to solve this? Or is it even possible to do such thing?? It worked with my friends running windows.